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【简答题】

行星轮系中至少有一个齿轮的 相对 转动,且常称该轮为 。

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参考解析:
.
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举一反三

【单选题】Passage 3 Questions 11 to 15 are based on the following passage: Scientists in India have invented a new way to produce electricity. Their invention does not get its power from oil, coal or other fuel...

A.
Because bullocks have long been used by Indian people
B.
Because bullocks walk slowly and are easy to control.
C.
Because there are few non-working bullocks in India
D.
Because there is not enough oil in India.
相关题目:
【单选题】Passage 3 Questions 11 to 15 are based on the following passage: Scientists in India have invented a new way to produce electricity. Their invention does not get its power from oil, coal or other fuel...
A.
Because bullocks have long been used by Indian people
B.
Because bullocks walk slowly and are easy to control.
C.
Because there are few non-working bullocks in India
D.
Because there is not enough oil in India.
【单选题】【单选题】( )的周转轮系,称为行星轮系。
A.
单自由度
B.
无自由度
C.
双自由度
D.
三自由度
【多选题】基本行星轮系由( )组成。
A.
行星轮
B.
太阳轮
C.
惰轮
D.
行星架